Sources of my "Digital Contrail"

• I make a mobile phone call:  Phone location tracking data (i.e. from towers) created and tracked by the carrier; phone log files; data created and stored by multiple mobile apps and their own hosting infrastructures 
• I browse the web: Site tracking; clickstream storage; site analytics; Email storage, including replication on devices as well as replication in geographical-mirrored data centers.
• Driving my car: Location-based tracking by RFID tags at toll booths; unique instrumentation data such from as OnStar systems
• Go to the bank: data streams initiated and stored from a simple ATM withdrawals; security analysis of banking transaction patterns; audit and verification trails for individual transactions; mirrored/backed-up data within the bank's data center
• Go to a shop: data streams initiated and stored from a simple credit card transaction; product inventory changes; buying patterns stored and allocated to individual affinity discount programs
• Browse an online store: All of the above, plus clickstream storage and analysis
• Plan some travel: Airline reservations & pricing systems such as SABRE ticketing; airline tracking databases; TSA flyer database updates & analysis
• At my house: electricity usage via smart metering data collection
• Using entertainment: Uploaded Photography and Video; sales pattern data and DRM data 
• Go to the doctor’s surgery: Medical imaging , EMR data, reports, other records
• Somewhere in the background: With everything I do, there are surely security systems,  kicking-off background data processes and analytics DB’s
• Also somewhere the background: Every service is sourced from a data center, where all data (including device data) is surely replicated and backed-up, including log files.

http://fountnhead.blogspot.co.uk/search/label/Big%20Data